/*
 * Copyright (c) 2017, MegaEase
 * All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.megaease.easeagent.demo.load.balanced;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.loadbalancer.reactive.ReactorLoadBalancerExchangeFilterFunction;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.reactive.function.client.WebClient;
import reactor.core.publisher.Mono;

/**
 * @author Olga Maciaszek-Sharma
 */
@SpringBootApplication
@RestController
public class UserApplication {

	private final WebClient.Builder loadBalancedWebClientBuilder;
	private final ReactorLoadBalancerExchangeFilterFunction lbFunction;

	public UserApplication(WebClient.Builder webClientBuilder,
			ReactorLoadBalancerExchangeFilterFunction lbFunction) {
		this.loadBalancedWebClientBuilder = webClientBuilder;
		this.lbFunction = lbFunction;
	}

	public static void main(String[] args) {
		SpringApplication.run(UserApplication.class, args);
	}

	@RequestMapping("/hi")
	public Mono<String> hi(@RequestParam(value = "name", defaultValue = "Mary") String name) {
		return loadBalancedWebClientBuilder.build().get().uri("http://say-hello/example")
				.retrieve().bodyToMono(String.class)
				.map(greeting -> String.format("%s, %s!", greeting, name));
	}

	@RequestMapping("/hello")
	public Mono<String> hello(@RequestParam(value = "name", defaultValue = "John") String name) {
		return WebClient.builder()
				.filter(lbFunction)
				.build().get().uri("http://say-hello/example")
				.retrieve().bodyToMono(String.class)
				.map(greeting -> String.format("%s, %s!", greeting, name));
	}
}

